Trump is responding to the meeting of North Korea's Kim Jong Un with South Korean President Moon Jae-in in South Korea. They pledged in a joint statement to rid their peninsula of nuclear weapons — but didn't identify any specific new measures to achieve that.

Trump is expected to meet with Kim in late May or June.

He tweeted: "KOREAN WAR TO END! The United States, and all of its GREAT people, should be very proud of what is now taking place in Korea!"